Rayed Keyhole Limpet
Fissurella nimbosa (Linnaeus, 1758)
The Rayed Keyhole Limpet (there is no official vernacular name- suggested by Harry Lee) was unknown as a live species in North America until two shell were found in 2017 in Hobe Sound. I've found three versions on S. Hutchinson Island beaches. Below are two shells-- the shell on the right has been damaged.
Rayed Keyhole Limpets (S. Hutchinson Island January 2021)
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National Exotic Marine and Estuarine Species Information System:
Fissurella nimbosa is commonly known as the Rayed Keyhole Limpet. Its native range extends from Mexico and Puerto Rico to northern Brazil, where it is typically found on tropical rocky intertidal shores. In 2017, two shells of this limpet were recorded in Coral Cove Park, Palm Beach County, Florida. No live specimens were found so the establishment status of this species is unknown. Coral Cove Park is about 2000 km from the nearest known established population.